These are bits and pieces of an increasingly unrestrained manifestation of racism directed toward Mr. Obama that is being fed by hate-mongers on talk radio and is widely tolerated, if not encouraged, by Republican Party leaders. It’s disgusting, and it’s dangerous. But it’s the same old filthy racism that has been there all along and that has been exploited by the G.O.P. since the 1960s.

I have no patience with those who want to pretend that racism is not an out-and-out big deal in the United States, as it always has been. We may have made progress, and we may have a black president, but the scourge is still with us. And if you needed Jimmy Carter to remind you of that, then you’ve been wandering around with your eyes closed.